io.js 2.1.0 发布，此版本值得关注的改进：

• crypto: Diffie-Hellman key exchange (DHE) parameters ('dhparams') must now be 1024 bits or longer or an error will be thrown.  #1739.

• node: A new --trace-sync-io command line flag will print a warning and a stack trace whenever a synchronous API is used.  #1707.

• node: To allow for chaining of methods, the setTimeout(), setKeepAlive(), setNoDelay(), ref() and unref() methods used in 'net', 'dgram', 'http', 'https' and 'tls' now return the current instance instead of undefined (Roman Reiss & Evan Lucas) #1699 #1768 #1779.

• npm: Upgraded to v2.10.1, release notes can be found in https://github.com/npm/npm/releases/tag/v2.10.1 and https://github.com/npm/npm/releases/tag/v2.10.0.

• util: A significant speed-up (in the order of 35%) for the common-case of a single string argument to util.format(), used by console.log() (Сковорода Никита Андреевич) #1749.

此版本现已提供下载：https://github.com/nodejs/io.js/archive/v2.1.0.zip。

更多内容请看更新日志。

IO.js 是为 V8 引擎编写的基于事件 IO 的实现。

构建要求：

* `gcc` and `g++` 4.8 or newer, or
* `clang` and `clang++` 3.3 or newer
* Python 2.6 or 2.7
* GNU Make 3.81 or newer
* libexecinfo (FreeBSD and OpenBSD only)